APA (7th ed.) Citation

(1951). Memorandum, Armstrong to The Secretary, August 9, 1951, Top Secret.

Chicago Style (17th ed.) Citation

Memorandum, Armstrong to The Secretary, August 9, 1951, Top Secret. 1951.

MLA (8th ed.) Citation

Memorandum, Armstrong to The Secretary, August 9, 1951, Top Secret. 1951.

Warning: These citations may not always be 100% accurate.